From 1d5c58e22d603cba82ed2e1f3294d6060e95b326 Mon Sep 17 00:00:00 2001
From: Christine Dodrill <me@christine.website>
Date: Sun, 26 Mar 2017 15:14:13 -0700
Subject: [PATCH] tun2: pingloop

---
 lib/tun2/server.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/lib/tun2/server.go b/lib/tun2/server.go
index 0dbe173..74ff24d 100644
--- a/lib/tun2/server.go
+++ b/lib/tun2/server.go
@@ -11,6 +11,7 @@ import (
 	"net"
 	"net/http"
 	"sync"
+	"time"
 
 	"git.xeserv.us/xena/route/database"
 	"github.com/Xe/ln"
@@ -139,6 +140,31 @@ func (s *Server) ListenAndServe() error {
 		}()
 	}
 
+	go func() {
+		for {
+			time.Sleep(5 * time.Second)
+
+			s.connlock.Lock()
+
+			for conn, c := range s.conns {
+				conn.SetDeadline(time.Now().Add(1 * time.Second))
+				req, err := http.NewRequest("GET", "http://backend/health", nil)
+				if err != nil {
+					panic(err)
+				}
+
+				_, err = s.RoundTrip(req)
+				if err != nil {
+					ln.Error(err)
+
+					c.cancel()
+				}
+			}
+
+			s.connlock.Unlock()
+		}
+	}()
+
 	return nil
 }